I'm importing grayscale elevation images (bmp and jpeg) into a program I use for 3d CNC terrain carving. I've been downloading Hi-Res terrain corrected DEM files from ALOS PALSAR. I bring them into ER Viewer and export them as bmp files.
When I extrude the bmp the terrain is stepped, which onscreen grayscale looks smooth and does not indicate.
What am I doing wrong here. It must be something I don't understand about raster files and the way they behave. I just want to have raster files that are smooth and not stepping. I'm calling it stepping as its not exactly like contour lines but it will be noticable when I come to carve these.